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/*************************************************************************
** Length.cpp **
** **
** This file is part of dvisvgm -- a fast DVI to SVG converter **
** Copyright (C) 2005-2023 Martin Gieseking <martin.gieseking@uos.de> **
** **
** This program is free software; you can redistribute it and/or **
** modify it under the terms of the GNU General Public License as **
** published by the Free Software Foundation; either version 3 of **
** the License, or (at your option) any later version. **
** **
** This program is distributed in the hope that it will be useful, but **
** WITHOUT ANY WARRANTY; without even the implied warranty of **
** MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the **
** GNU General Public License for more details. **
** **
** You should have received a copy of the GNU General Public License **
** along with this program; if not, see <http://www.gnu.org/licenses/>. **
*************************************************************************/
#include <sstream>
#include "InputReader.hpp"
#include "Length.hpp"
using namespace std;
void Length::set (const string &lenstr) {
switch (lenstr.length()) {
case 0:
_pt = 0;
break;
case 1:
if (isdigit(lenstr[0]))
_pt = lenstr[0] - '0';
else
throw UnitException(string("invalid length: ")+lenstr);
break;
default:
istringstream iss(lenstr);
StreamInputReader ir(iss);
double val;
if (!ir.parseDouble(val))
throw UnitException(string("invalid length: ")+lenstr);
string unit = ir.getWord();
set(val, unit);
}
}
void Length::set (double val, Unit unit) {
switch (unit) {
case Unit::PT: _pt = val; break;
case Unit::BP: _pt = val/pt2bp; break;
case Unit::IN: _pt = val/pt2in; break;
case Unit::CM: _pt = val/pt2cm; break;
case Unit::MM: _pt = val/pt2mm; break;
case Unit::PC: _pt = val/pt2pc; break;
case Unit::DD: _pt = val/pt2dd; break;
case Unit::CC: _pt = val/pt2cc; break;
case Unit::SP: _pt = val/pt2sp; break;
default:
// this isn't supposed to happen
throw UnitException("invalid length unit: (" + std::to_string(static_cast<int>(unit)) + ")");
}
}
double Length::get (Unit unit) const {
switch (unit) {
case Unit::PT: return pt();
case Unit::BP: return bp();
case Unit::IN: return in();
case Unit::CM: return cm();
case Unit::MM: return mm();
case Unit::PC: return pc();
case Unit::DD: return dd();
case Unit::CC: return cc();
case Unit::SP: return sp();
}
// this isn't supposed to happen
throw UnitException("invalid length unit: (" + std::to_string(static_cast<int>(unit)) + ")");
}
string Length::toString (Unit unit) const {
ostringstream oss;
oss << get(unit) << unitToString(unit);
return oss.str();
}
static constexpr int unit_id (int c1, int c2) {
return (c1 << 8) | c2;
}
Length::Unit Length::stringToUnit (const std::string &unitstr) {
if (unitstr.length() == 2) {
switch (unit_id(unitstr[0], unitstr[1])) {
case unit_id('p','t'): return Unit::PT;
case unit_id('b','p'): return Unit::BP;
case unit_id('i','n'): return Unit::IN;
case unit_id('c','m'): return Unit::CM;
case unit_id('m','m'): return Unit::MM;
case unit_id('p','c'): return Unit::PC;
case unit_id('d','d'): return Unit::DD;
case unit_id('c','c'): return Unit::CC;
case unit_id('s','p'): return Unit::SP;
}
}
throw UnitException(string("invalid length unit: ") + unitstr);
}
string Length::unitToString (Unit unit) {
switch (unit) {
case Unit::PT: return "pt";
case Unit::BP: return "bp";
case Unit::IN: return "in";
case Unit::CM: return "cm";
case Unit::MM: return "mm";
case Unit::PC: return "pc";
case Unit::DD: return "dd";
case Unit::CC: return "cc";
case Unit::SP: return "sp";
}
// this isn't supposed to happen
return "??";
}
void Length::set (double val, string unitstr) {
if (unitstr.empty())
unitstr = "pt";
else if (unitstr.length() != 2)
throw UnitException(string("invalid length unit: ") + unitstr);
set(val, stringToUnit(unitstr));
}
map<string,Length::Unit> Length::getUnits () {
map<string,Length::Unit> units = {
{"pt", Unit::PT},
{"bp", Unit::BP},
{"in", Unit::IN},
{"cm", Unit::CM},
{"mm", Unit::MM},
{"pc", Unit::PC},
{"dd", Unit::DD},
{"cc", Unit::CC},
{"sp", Unit::SP},
};
return units;
}
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